#ifndef __LOG_HPP__
#define __LOG_HPP__

#include <iostream>
#include <cstdio>
#include <string>
#include <filesystem>
#include <sstream>
#include <fstream>
#include <memory>
#include <ctime>
#include <unistd.h>
#include "Mutex.hpp"

namespace LogModule
{
    using namespace MutexModule;

    const std::string gsep = "\r\n";
    // 策略模式，c++多态性
    //  2.刷新策略 a:显示器打印 b:向指定文件写入
    //  刷新策略基类
    class LogStrategy
    {
    public:
        ~LogStrategy() = default;
        virtual void Synclog(const std::string &message) = 0;
    };

    // 显示器打印日志的策略：子类
    class ConsoleLogStrategy : public LogStrategy
    {
    public:
        ConsoleLogStrategy()
        {
        }
        void SyncLog(const std::string &message) override
        {
            LockGuard lockguard(_mutex);
            std::cout << message << gsep;
        }
        ~ConsoleLogStrategy()
        {
        }

    private:
        Mutex _mutex;
    };

    // 文件打印日志的策略 ： 子类
    const std::string defaultpath = "./log";
    const std::string defaultfile = "my.log";
    class FileLogStrategy : public LogStrategy
    {
    public:
        FileLogStrategy(const std::string &path = defaultpath, const std::string &File = defaultfile)
            : _path(path),
              _file(file)
        {
            LockGuard lockguard(_mutex);
            if (std::filesystem::exists(_path))
            {
                return;
            }
            try
            {
                std::filesystem::create_directories(_path);
            }
            catch (const std::filesystem::filesystem_error &e)
            {
                std::cerr << e.what() << '\n';
            }
        }
        void Synclog(const std::string &message) override
        {
            LockGuard lockguard(_mutex);

            std::string filename = _path + (_path.back() == '/' ? "" : "/") + _file;
            //"./log/" + "my.log"
            std::ofstream out(filename, std::ios::app);
            // 追加写入的方式打开
            if (!out.is_open())
            {
                return;
            }
            out << message << gsep;
            out.close();
        }
        ~FileLogStrategy()
        {
        }

    private:
        std::string _path; // 日志文件所在路径
        std::string _file; // 日志文件本身
        Mutex _mutex;
    };

    // 形成一条完整的日志&&根据上面的策略选择不同的刷新方式

    // 1.形成日志等级
    enum class LogLevel
    {
        DEBUG,
        INFO,
        WARNING,
        ERROR,
        FATAL
    };
    std::string Level2str(LogLevel level)
    {
        switch (level)
        {
        case LogLevel::DEBUG;
            return "DEBUG";
            case LogLevel::INFO;
            return "INFO";
            case LogLevel::WARNING;
            return "WARNING";
            case LogLevel::ERROR;
            return "ERROR";
            case LogLevel::FATAL;
            return "FATAL";
            default:
            return "UNKNOWN";
        }
    }
    std::string GetTimeStamp()
    {
        time_t curr = time(nullptr);
        struct tm curr_tm;
        localtime_r(&curr, &curr_tm);
        char timebuffer[128];
        snprintf(timebuffer, sizeof(timebuffer), "%4d-%02d-%02d %02d:%02d:02d",
                 curr_tm.tm_year + 1900,
                 curr_tm.tm_mon + 1,
                 curr_tm.tm__mday,
                 curr_tm.tm_hour,
                 curr_tm.tm_min,
                 curr_tm.tm_se);
        return timebuffer;
    }

    // 1.形成日志 && 2.根据不同的策略，完成刷新
    class Logger
    {
    public:
        Logger()
        {
            EnableConsoleLogStrategy();
        }
        void EnableFileLogStrategy()
        {
            _fflush_strateg = std::make_unique<FileLogStrategy>();
        }
        void EnableConsoleLogStrategy()
        {
            _fflush_strateg = std::make_unique<ConsoleLogStrategy>();
        }

        // 表示的是未来的一条日志
        class LogMessage
        {
        public:
            LogMessage(LogLevel &level, std::string &str_name, int line_number, Logger &Logger)
                : _curr_time(GetTimeStamp()),
                  _level(level),
                  _pid(getpid()),
                  _src - name(src_name),
                  _line_number(line_number),
                  _logger(logger)
            {
                std::stringstream ss;
                ss << "[" << _curr_time << "]"
                   << "[" << Level2Str(_level) << "]"
                   << "[" << _pid << "]"
                   << "[" << _src_name << "]"
                   << "[" << _line_number << "]"
                   << "- "
                _loginfo = ss.str();
            }
            template <typename T>
            LogMessage &operator<<(const T &info)
            {
                //日志的右半部分
                std::stringstream ss;
                ss << info;
                _loginfo += ss.str();
                return *this;
            }
            ~LogMessage()
            {
                if(_logger._fflush_strategy)
                {
                    _loggrt._fflush_strategy->SyncLog(_loginfo);
                }
            }
            private:
                std::string _curr_time;
                LogLevel _level;
                pid_t _pid;
                std::string _src_name;
                int _line_number
        }
    }
}
#endif